You’ve got two problems with that one:
The first I’ve pointed out to you multiple times and you keep ignoring.
The second is he got tackled and disarmed by unarmed civilians, never confronted by police or anybody with drawn guns.
I ignore your point because you have not addressed my initial point: when confronted with the choice of death or continuing to kill, these perps stop. Thus, the penalty of death deters crime.
CAUSE: The immediate threat of death.
EFFECT: Perp stops.
Have a nice day!